/Engine/Plugins/Online/OnlineServices/Source/OnlineServicesCommon/Public/Online/OnlineAsyncOp.h
template<typename ReturnType, typename... ParamTypes> struct TOnlineAsyncOpCallableTraitsHelper< ReturnType(ParamTypes...)> : public [UE::Online::Private::TOnlineAsyncOpCallableTraitsHelper2< ReturnType, ParamTypes... >](API\Plugins\OnlineServicesCommon\Online\TOnlineAsyncOpCallableTraitsHelp-_1)